In view of the demand for high-energy and high-bandwidth signal detection in X-ray communication (XCOM) during spacecraft reentry blackout, a detection module using fast-decay LYSO scintillator coupled with Silicon photomultiplier (SiPM) was proposed in this study. The theoretical model based on the Monte Carlo simulation and Personick’ theory was established and the detector prototype was built. Moreover, the signal to noise ratio (SNR) and bit error rate (BER) performance were investigated. Results present that the SNR of 19.8 dB, 29.9 dB and 35.5 dB could be reached for X-ray with the energy of 17 keV, 59.5 keV and 122 keV respectively. This energy response characteristic is much suitable for the X-ray signal detection during spacecraft reentry blackout. Additionally, the deviation of SNR corresponding to the BER between the theoretical and experimental results does not exceed 0.3 dB when the data rate is 100 kbps, which proves the validity of the theoretical model. Furthermore, the numerical analysis shows that the scheme demonstrates high SNR and low BER performance in high bandwidth and low signal receiving power, which explains the superiorities in X-ray signal detection of the design. This work provides the theoretical basis and design reference for the LYSO–SiPM X-ray signal detection module.

针对航天器再入停电期间X射线通信（XCOM）对高能、高带宽信号探测的需求，一种采用快衰变LYSO闪烁体的探测模块本研究提出了与硅光电倍增管（SiPM）相结合的方案。建立了基于蒙特卡罗模拟和Personick'理论的理论模型，并构建了探测器原型。此外，还研究了信噪比 (SNR) 和误码率 (BER) 性能。结果表明，能量分别为17 keV、59.5 keV和122 keV的X射线的信噪比分别为19.8 dB、29.9 dB和35.5 dB。这种能量响应特性非常适合航天器再入断电时的X射线信号探测。此外，当数据速率为100 kbps时，理论和实验结果之间BER对应的SNR偏差不超过0.3 dB，证明了理论模型的有效性。此外，带宽和低信号接收功率，这说明了该设计在 X 射线信号检测方面的优势。该工作为LYSO-SiPM X射线信号检测模块提供了理论依据和设计参考。